{"product_id":"ref-56-w189-00b-wo","title":"WOSSNER 77mm PISTON KIT B YAMAHA YZ250F 05-07, WR250F 01-13, GASGAS EC250F 10-15","description":"\u003cbody\u003e\n\n\n\n\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003eWossner forged piston kit with a 77.01mm bore, designed for Yamaha WR250F, YZ250F, and Gas Gas EC250F models. This three-ring piston is engineered for optimal combustion chamber heat transfer and uniform bearing surface under heat expansion, reducing localized pressure and piston collapse. Manufactured in Germany for durability and precision.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eForged piston for superior strength and design\u003c\/li\u003e \t\u003cli\u003eThree-ring design for enhanced sealing and durability\u003c\/li\u003e \t\u003cli\u003eOptimized heat transfer to cylinder walls\u003c\/li\u003e \t\u003cli\u003eElliptical design for uniform bearing surface and even thrust load distribution\u003c\/li\u003e \t\u003cli\u003eManufactured in Germany\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eBore: 77.01mm (+0.01mm oversize)\u003c\/li\u003e \t\u003cli\u003eStandard size piston (PN# 8614DB)\u003c\/li\u003e \t\u003cli\u003eLock Part Number: CW16\u003c\/li\u003e \t\u003cli\u003ePin Part Number: WP059\u003c\/li\u003e \t\u003cli\u003eRing Set Part Number: 770XAS\u003c\/li\u003e \t\u003cli\u003eDisplacement: 249 cm³\u003c\/li\u003e \t\u003cli\u003eStroke: 53.6mm\u003c\/li\u003e \t\u003cli\u003eClearance: 0.04mm\u003c\/li\u003e \t\u003cli\u003eWossner Compression Ratio: OEM\u003c\/li\u003e \t\u003cli\u003eOEM Compression Ratio: 12.50:1\u003c\/li\u003e \t\u003cli\u003eDome Volume: -4.50 cm³\u003c\/li\u003e \t\u003cli\u003eCompression Height: 22.20mm\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eCross-Reference OEM Part Numbers\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eNot provided\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eVehicle Fitments\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003eYamaha WR250F (2005-2007)\u003c\/li\u003e \t\u003cli\u003eYamaha YZ250F (2005-2007)\u003c\/li\u003e \t\u003cli\u003eGas Gas EC250F (2010-2015)\u003c\/li\u003e \u003c\/ul\u003e\n\u003cp\u003eMajority of our listings are for a direct replacement for your original part.\u003c\/p\u003e\n\u003cp\u003eOur parts are made of quality and are designed to meet or exceed the original OEM Standards.\u003c\/p\u003e\n\u003cp\u003eOur products are often a cost effective alternative to genuine OEM Parts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note: \u003c\/strong\u003ethe models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models. \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\n\u003c\/body\u003e","brand":"AW Motorcycle Parts","offers":[{"title":"Default Title","offer_id":55594725671286,"sku":"REF 56-W189+00B.WO","price":162.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/7032\/3318\/files\/stock53867_1.jpg?v=1746772105","url":"https:\/\/n0jgtc-nz.myshopify.com\/products\/ref-56-w189-00b-wo","provider":"AW Motorcycle Parts","version":"1.0","type":"link"}